From: Atish Patra <atishp@rivosinc.com>
To: linux-kernel@vger.kernel.org
Cc: Atish Patra <atishp@rivosinc.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Atish Patra <atishp@atishpatra.org>,
Anup Patel <anup@brainfault.org>,
Damien Le Moal <damien.lemoal@wdc.com>,
devicetree@vger.kernel.org, Jisheng Zhang <jszhang@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
linux-riscv@lists.infradead.org,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Rob Herring <robh+dt@kernel.org>
Subject: [PATCH v2 0/6] Provide a fraemework for RISC-V ISA extensions
Date: Thu, 10 Feb 2022 13:40:12 -0800 [thread overview]
Message-ID: <20220210214018.55739-1-atishp@rivosinc.com> (raw)
This series implements a generic framework to parse multi-letter ISA
extensions. This series is based on Tsukasa's v3 isa extension improvement
series[1]. I have fixed few bugs and improved comments from that series
(PATCH1-3). I have not used PATCH 4 from that series as we are not using
ISA extension versioning as of now. We can add that later if required.
PATCH 4 allows the probing of multi-letter extensions via a macro.
It continues to use the common isa extensions between all the harts.
Thus hetergenous hart systems will only see the common ISA extensions.
PATCH 6 improves the /proc/cpuinfo interface for the available ISA extensions
via /proc/cpuinfo.
Here is the example output of /proc/cpuinfo:
(with debug patches in Qemu and Linux kernel)
/ # cat /proc/cpuinfo
processor : 0
hart : 0
isa : rv64imafdcsu
isa-ext : sstc,sscofpmf
mmu : sv48
processor : 1
hart : 1
isa : rv64imafdcsu
isa-ext : sstc,sscofpmf
mmu : sv48
processor : 2
hart : 2
isa : rv64imafdcsu
isa-ext : sstc,sscofpmf
mmu : sv48
processor : 3
hart : 3
isa : rv64imafdcsu
isa-ext : sstc,sscofpmf
mmu : sv48
Anybody adding support for any new multi-letter extensions should add an
entry to the riscv_isa_ext_id and the isa extension array.
E.g. The patch[2] adds the support for sstc extension.
[1] https://lore.kernel.org/all/0f568515-a05e-8204-aae3-035975af3ee8@irq.a4lg.com/T/
[2] https://github.com/atishp04/linux/commit/dfc9b0d16f5a6e4695f0b3ca2f6e3f99654992db
Changes from v1->v2:
1. Instead of adding a separate DT property use the riscv,isa property.
2. Based on Tsukasa's v3 isa extension improvement series.
Atish Patra (3):
RISC-V: Implement multi-letter ISA extension probing framework
RISC-V: Do no continue isa string parsing without correct XLEN
RISC-V: Improve /proc/cpuinfo output for ISA extensions
Tsukasa OI (3):
RISC-V: Correctly print supported extensions
RISC-V: Minimal parser for "riscv, isa" strings
RISC-V: Extract multi-letter extension names from "riscv,isa"
arch/riscv/include/asm/hwcap.h | 25 +++++++
arch/riscv/kernel/cpu.c | 44 ++++++++++-
arch/riscv/kernel/cpufeature.c | 132 ++++++++++++++++++++++++++++-----
3 files changed, 180 insertions(+), 21 deletions(-)
--
2.30.2
next reply other threads:[~2022-02-10 21:40 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-10 21:40 Atish Patra [this message]
2022-02-10 21:40 ` [PATCH v2 1/6] RISC-V: Correctly print supported extensions Atish Patra
2022-02-10 21:40 ` [PATCH v2 2/6] RISC-V: Minimal parser for "riscv, isa" strings Atish Patra
2022-02-10 21:40 ` [PATCH v2 3/6] RISC-V: Extract multi-letter extension names from "riscv,isa" Atish Patra
2022-02-10 21:40 ` [PATCH v2 4/6] RISC-V: Implement multi-letter ISA extension probing framework Atish Patra
2022-02-14 20:05 ` Heiko Stübner
2022-02-14 20:14 ` Atish Patra
2022-02-14 20:24 ` Heiko Stübner
2022-02-14 20:42 ` Atish Patra
2022-02-14 22:22 ` Heiko Stübner
2022-02-14 23:22 ` Atish Kumar Patra
2022-02-15 9:12 ` Atish Kumar Patra
2022-02-15 9:48 ` Heiko Stübner
2022-02-15 9:50 ` Heiko Stübner
2022-02-16 0:47 ` Atish Kumar Patra
2022-02-10 21:40 ` [PATCH v2 5/6] RISC-V: Do no continue isa string parsing without correct XLEN Atish Patra
2022-02-10 21:58 ` Andreas Schwab
2022-02-11 12:52 ` Geert Uytterhoeven
2022-02-14 20:15 ` Atish Patra
2022-02-14 20:06 ` Heiko Stübner
2022-02-10 21:40 ` [PATCH v2 6/6] RISC-V: Improve /proc/cpuinfo output for ISA extensions Atish Patra
2022-02-14 20:07 ` Heiko Stübner
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